package org.openfantasia.musica.instruments.jmusic;

import jm.audio.AudioObject;
import jm.audio.Instrument;
import jm.audio.io.SampleOut;
import jm.audio.synth.*;

/**
 * A  sawtooth waveform instrument implementation
 * which iincludes a low pass filter that is swept by
 * a three filters - two forming a band pass anf
 * one as the low pass.
 *
 * @author Andrew Brown
 */

public final class ResSawInst extends Instrument {
	//----------------------------------------------
	// Attributes
	//----------------------------------------------

	private int sampleRate;

	private int filterCutoff;

	private int channels;

	//----------------------------------------------
	// Constructor
	//----------------------------------------------


	/**
	 * Basic default constructor to set an initial
	 * sampling rate
	 *
	 * @param sampleRate
	 */
	public ResSawInst(int sampleRate) {
		this(sampleRate, 2500, 1);
	}


	/**
	 * Constructor that sets sample rate and filter cutoff
	 *
	 * @param sampleRate	 The number of samples per second (quality)
	 * @param filterCutoff The frequency above which overtones are cut
	 */
	public ResSawInst(int sampleRate, int filterCutoff) {
		this(sampleRate, filterCutoff, 1);
	}


	/**
	 * Constructor that sets sample rate , cutoff and channels
	 *
	 * @param sampleRate	 The number of samples per second (quality)
	 * @param filterCutoff The frequency above which overtones are cut
	 * @param channels		 1 for Mono or 2 for Stereo
	 */
	public ResSawInst(int sampleRate, int filterCutoff, int channels) {
		this.sampleRate = sampleRate;
		this.filterCutoff = filterCutoff;
		this.channels = channels;
	}

	//----------------------------------------------
	// Methods 
	//----------------------------------------------


	/**
	 * Initialisation method used to build the objects that
	 * this instrument will use and specify thier interconnections.
	 */
	public void createChain() {
		// filter mod source 1
		Value modfreq = new Value(this, this.sampleRate, this.channels, (float) 0.5);
		Oscillator sineMod = new Oscillator(modfreq, Oscillator.COSINE_WAVE, Oscillator.FREQUENCY);
		Splitter lfo = new Splitter(sineMod);
		sineMod.setAmp((float) 2000.0);
		Oscillator wt = new Oscillator(this, Oscillator.SAWTOOTH_WAVE, this.sampleRate, this.channels);
		Filter filt = new Filter(new AudioObject[]{wt, lfo}, this.filterCutoff, Filter.LOW_PASS);
		// filter mod source 2
		Filter filt2 = new Filter(new AudioObject[]{filt, lfo}, this.filterCutoff, Filter.HIGH_PASS);
		Volume vol2 = new Volume(filt2, (float) 10.0); // amount of resonance
		// filter mod source 3
		Oscillator wt3 = new Oscillator(this, Oscillator.SAWTOOTH_WAVE, this.sampleRate, this.channels);
		Filter filt3 = new Filter(new AudioObject[]{wt3, lfo}, this.filterCutoff, Filter.LOW_PASS);
		Volume vol3 = new Volume(filt3);
		// add and pocess everythning
		Add add = new Add(new AudioObject[]{vol2, vol3});
		Envelope env = new Envelope(add,
				new double[]{0.0, 0.0, 0.05, 1.0, 0.2, 0.4, 0.8, 0.3, 1.0, 0.0});
		StereoPan span = new StereoPan(env);
		SampleOut sout = new SampleOut(span);
	}
}

